Merge pull request #3100 from jepler/update-ulab

Update ulab

extmod/ulab

@@ -1 +1 @@
-Subproject commit 0394801933f6e68a5bc7cdb0da76c7884e8cf70a
+Subproject commit 48cb939839fcf091fcdcdf742530b1b650066a15

locale/circuitpython.pot

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-06-26 11:50-0500\n"
+"POT-Creation-Date: 2020-07-01 10:33-0500\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -3009,6 +3009,10 @@ msgstr ""
 msgid "sleep length must be non-negative"
 msgstr ""
 
+#: extmod/ulab/code/ndarray.c
+msgid "slice step can't be zero"
+msgstr ""
+
 #: py/objslice.c py/sequence.c
 msgid "slice step cannot be zero"
 msgstr ""
@@ -3025,6 +3029,18 @@ msgstr ""
 msgid "sort argument must be an ndarray"
 msgstr ""
 
+#: extmod/ulab/code/filter.c
+msgid "sos array must be of shape (n_section, 6)"
+msgstr ""
+
+#: extmod/ulab/code/filter.c
+msgid "sos[:, 3] should be all ones"
+msgstr ""
+
+#: extmod/ulab/code/filter.c
+msgid "sosfilt requires iterable arguments"
+msgstr ""
+
 #: py/objstr.c
 msgid "start/end indices"
 msgstr ""
@@ -3314,3 +3330,15 @@ msgstr ""
 #: py/objrange.c
 msgid "zero step"
 msgstr ""
+
+#: extmod/ulab/code/filter.c
+msgid "zi must be an ndarray"
+msgstr ""
+
+#: extmod/ulab/code/filter.c
+msgid "zi must be of float type"
+msgstr ""
+
+#: extmod/ulab/code/filter.c
+msgid "zi must be of shape (n_section, 2)"
+msgstr ""

shared-bindings/ulab/filter/__init__.pyi

@@ -17,3 +17,20 @@ def convolve(r, c=None):
 
     Convolution is most time-efficient when both inputs are of float type."""
     ...
+
+def sosfilt(sos : ulab.array, x : ulab.array, *, xi : Optional[ulab.array] = None) -> Union[ulab.array, Tuple[ulab.array, ulab.array]]:
+    """
+    :param ulab.array sos: Array of second-order filter coefficients, must have shape (n_sections, 6). Each row corresponds to a second-order section, with the first three columns providing the numerator coefficients and the last three providing the denominator coefficients.
+    :param ulab.array x: The data to be filtered
+    :param ulab.array zi: Optional initial conditions for the filter
+
+    :return: If ``xi`` is not specified, the filter result alone is returned.  If ``xi`` is specified, the return value is a 2-tuple of the filter result and the final filter conditions.
+
+    Filter data along one dimension using cascaded second-order sections.
+
+    Filter a data sequence, x, using a digital IIR filter defined by sos.
+
+    The filter function is implemented as a series of second-order filters with direct-form II transposed structure. It is designed to minimize numerical precision errors for high-order filters.
+
+    Filter coefficients can be generated by using scipy's filter generators such as ``signal.ellip(..., output='sos')``."""
+    ...